[PATCH] staging: erofs: fix error handling in __erofs_get_meta_page

[chao@kernel.org (Chao Yu)]

On 2018/8/20 23:36, Gao Xiang wrote:
> Hi Chao,
> 
> On 2018/8/20 22:59, Chao Yu wrote:
>> On 2018/8/20 21:29, Gao Xiang wrote:
>>> As Dan reported in LKP's mailing list:
>>>
>>> https://lists.01.org/pipermail/kbuild-all/2018-August/051419.html
>>>
>>> New smatch warnings:
>>> drivers/staging/erofs/internal.h:446 erofs_grab_bio() warn: should 'blkaddr << (12 - 9)' be a 64 bit type?
>>> drivers/staging/erofs/data.c:78 __erofs_get_meta_page() error: 'bio' dereferencing possible ERR_PTR()
>>> drivers/staging/erofs/internal.h:446 erofs_grab_bio() warn: should 'blkaddr << (12 - 9)' be a 64 bit type?
>>>
>>> Old smatch warnings:
>>> drivers/staging/erofs/unzip_vle.c:989 z_erofs_vle_unzip() error: double unlock 'mutex:&z_pagemap_global_lock'
>>> drivers/staging/erofs/unzip_vle.c:1318 z_erofs_vle_normalaccess_readpage() warn: should 'page->index << 12' be a 64 bit type?
>>> drivers/staging/erofs/unzip_vle.c:1351 __z_erofs_vle_normalaccess_readpages() warn: should '()->index << 12' be a 64 bit type?
>>>
>>> Signed-off-by: Gao Xiang <gaoxiang25 at huawei.com>
>>> ---
>>> Hi Chao,
>>>
>>> Could you please fold this patch in the previous patch if it is convenient?
>>> `staging: erofs: separate erofs_get_meta_page'
>>>
>>> It seems v2 of these patches has not been sent out to the staging mailing list.
>>> LINK: https://lore.kernel.org/lkml/ffd2748a-273f-792b-d418-2fcf85c3d45f at huawei.com/
>> Hi Xiang,
>>
>> Let me merge this into previous buggy one. :)
>>
>> Thanks,
>>
> 
> Thanks for your quick patching :)
> 
> one more picky...
> LINK:
> https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git/tree/drivers/staging/erofs/data.c?h=erofs&id=418b414392c2b6e588670a672489dfd015d80bc1#n66
> 
> if (unlikely(IS_ERR(bio))) {  ===>  if (IS_ERR(bio)) {

Alright, let me update it. I missed this due to manually merging by myself, it
looks that git-am your entire eml-format patch will be better. :)

Thanks,

> 
> since
> 
> #define IS_ERR_VALUE(x) unlikely((unsigned long)(void *)(x) >= (unsigned
> long)-MAX_ERRNO)
> 
> static inline bool __must_check IS_ERR(__force const void *ptr)
> {
> 	return IS_ERR_VALUE((unsigned long)ptr);
> }
> 
> Thanks,
> Gao Xiang
>